I like Mario Sikora's take on enneagram instincts.
Here's a thread about it with other links:
http://www.the16types.info/vbulletin...-the-instincts
He treats the instincts as clusters of instincts grouped into three domains. Meaning, for example, that SP instinct isn't one instinct, but a cluster of instincts related to SP domain. A person can demonstrate some instincts of each domain without being required to demonstrate ALL the instincts related to any one domain. And he recognizes that instincts within a domain can compete with each other. He also doesn't limit the instinctual domains to survival/replication of genes, but also includes memes (such as ideas, beliefs, values, etc).
He labels the domains differently, which leads to less confusion about what the domain refers to.
* Preserving - & Nurturing. Preserving/nurturing comfort, wellbeing, and resources. Protectors of things that can be passed from one generation to the next (offspring, traditions, artifacts, pictures, heirlooms, rituals, etc)
* Transmitting - attracting & bonding; driven to spread a part of oneself beyond oneself. Concerned with the reproducing/replicating of genes/memes. Attracting attention and making one's voice heard.
* Navigating - making one's way through the world especially in relationship to others. Understanding how the group/community works, creating alignment w/ others, behaving in ways to be more acceptable to others, monitoring the behavior of others and establishing norms and mores. Collaboration, empathy, cooperation. The world of criticism (passing judgment) and marketing (presentations to make something/someone more/less socially acceptable)